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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1027ec0388c68fb165c8d9b8ad90093c14c135d4c858c62c6a4e7175ed6d295' 
  AND token = 'JsVXzbY/zAVGrrQpTv3EBJVnx2MP7cw3wAiaaT4yWas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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