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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5698e8ef056660d845287462fa6b5bf8dcfcb5a8c3c8bd81366c177d8007e26' 
  AND token = 'dVpjPoBn/OOGTqJWWf1RWdLQCz7L0mRIq8wNKfPhdxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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