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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9190c076ae0d60684c7659250589413e9f8cbbad110edf1a5c08e6cf7977a65f' 
  AND token = 'xp3PbC5llhdVcHdBwkAvQ5hhmKUIHSiYSARqiPyNZ04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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