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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c1112ef00ae0966dfe4f5a3adc12b95f797ed788db32f30092560d990ecebb3' 
  AND token = '9Tz7fl3d3lqHN19CSqsboxylMFYIoBMT5PewQODN1AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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