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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '654156eda0c9ce29a29bae55c41c689ae11c8961cc08eb2565948c51563cad06' 
  AND token = '/tuPIccfjOQseYOJmaLQYfml4DPWpVoecBg06O5a0J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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