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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c47e7d56fc976c54840e6f5e3a0cd0e7c1e29fa5ba36cdff143d50bc71c71782' 
  AND token = 'JCvAyAIzDLU39VfF8rLzHQzQRrr+KyNBktwwLLVdW2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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