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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88e5793d4d412731c2b80b2070323e9a98adb02862d4425f8644bc06a08a82cf' 
  AND token = 'GvbnNr3CIk7Iwy4URrS/8lLG9Gtm9Z8TXcaGnXuDS8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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