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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f4e85e9524e08a4e1d905852138551b86827ab54dd22aed0711fb4955c9f259' 
  AND token = 'i6K1ONeXFOD+NqFA0OaqQSz5dBE6WiRBHozw5mAJNYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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