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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '842b351de03d078baeebe6bb83a4e62f7e15526679c029efc408aa1ad566774a' 
  AND token = 'Q+vjbTiePsjvxqbm0bTeVyIXgbgRp0xgHvJ0SUEVsdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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