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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf63eeddd8be50e9286e66ce80e553aa803f3c8163fd8580b3105077a1b7210f' 
  AND token = 'MC6tr8XYUE/WDZEYtzf+UgGAMgUn4emVf7zl9a/sKgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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