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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b6d5c628c8ad4e99b3b723c429f39e7029d8cc665784762b56c58d923a73754' 
  AND token = '0QarvVIHAou9aqbWdVgAbJ99J8UXsEQDzwqxkrY+o2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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