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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1698d870bea7c5a1fd8885c6813fceda779bf71e9afa7b4ee2f8908a71167857' 
  AND token = 'YSrwtD3t5VfcEBiEjm6l/qWV7qXH1ED6ZYlzGuCvS4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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