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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e1fd5bf23e41126679d097e5ced39d9e86ba7af57e9bf6da55e719753a3ba9' 
  AND token = 'FUvEft/DJzGfyFOHkghRtgaWW5GgTFyp0yyaI1SQjOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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