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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b22615ba6a446658c1d38057570ba2fd7c6a44a5c84c7a633ed3069ada018ea' 
  AND token = '0cQ66Re5l04E5yqc4bYs4+UVUL1WFnm0duSDGi6f8mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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