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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d1f0e25feb9d331273640d04b82942069174ee0e18c222b60dda25db9c0815f' 
  AND token = 'waog24vQuR+H19CGUAlCyJQQG14X8vYoMezdi5nqlUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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