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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd118b879949399f8bff69e95434a1f07551451237a70e430bec3c4c324a757c7' 
  AND token = '2BYkqGwfKBR4rPWQurC4wwkx1hhaKWfiivx9lq8Gank=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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