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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1d038d43d46c6fe5b30aebb7619b6cf3f8816bf3a500a8fa57e2fcde406f89c' 
  AND token = 'psse0FiyhbuiWpywDmo0c46VWBVTaqJLHOGIJESSzJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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