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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59ac0232f34e3ed482f728f7f7f454e4a41e2d1b5b8fe0c557b5df17e6f02fd2' 
  AND token = 'ldl0Czstbg9tuwMQcAXHMMsl+Grqld6sHBmxmKmJEy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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