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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed463b9e81ef12453f559550f2e8ed43700450f46917b46df83355eca5802fd7' 
  AND token = 'TQI2pSXXbMEhNAmzfkdsjEJ6VVgbHD8AuNIekTKIoUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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