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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9300f0191d9d576f9199b014926095f2addcc60acf1d9a72c54580b76bc5f66c' 
  AND token = 'wHsBYfQyn7DKk2+udsjGM9R1SYfR5sYqW9q6ywMbuPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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