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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '420c7796cda817c9832c04f21f93236010e47f28ee4d2b3a3fc4ce41d02e5339' 
  AND token = 'teFN2gKpjFH8Kk5t7m1DnzCgPmaQYNm5ys257N1rqSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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