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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb11264301358f3730da6c8d3fa845ada12bbb7b997e5ccc7f46f96fe6ef7272' 
  AND token = 'iKlwi+E4CQVSggr6Fy6X7hdVYx7G8G+tB64g70rDXkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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