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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e96db0c26b1e18ce87b71d4be1bd1e53e2412a07a70468e9bab7c609e0b82ef0' 
  AND token = 'UrAgd2vr754ORKVmJNKRx1NCARaUvIa/8hTP5QXDkvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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