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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65ae491e0777dbb59e73958aeed1d684e7b083f5703b8c62979568aa3367f371' 
  AND token = 'q4pv+S21P6Vn8aynuQ9NVGM0Mwkq/Z/O50pveKRnxBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}