SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d624a125c6bbd58f270f5ecef6656f50d85d354d07c9651f985ab1145709c83' 
  AND token = 'zqSa9UWqhQhZBASCYCUG3XIm8jD1DX2xTLo+s9Q2UY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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