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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fe4ebb130963a156b0becf08a6c7339621eef9a0fb7293cca70d41aa88bba93' 
  AND token = '7DxDMiVkqtGECcm1MQ2vUfsgvGjOcCZ10jMZ0EttYS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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