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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b58d855a871b1514e74e61cb824bda15f956e0d23bdd8dece4402bc59639f9c' 
  AND token = 'efhVR4hNuKcSZg89frbs/TjPKaUwzAXnleKd2y/LBwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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