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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9038bb9518a0591f9b4f0437fe30c81eb5162fc6a879b18d5fde5cfc20054a1' 
  AND token = 'ZEZnV35R9SJCxWcQoQpibD3Vru5pziIqBnX0AlI0GrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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