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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc3cc8f63edbb1c905241760442f38c5e1efe845c7a79b1fd9daa7f79b685bb' 
  AND token = 'HgGeL1NZsA02KaQnbBJsbrSVo5d8ZA5Lkw1NYdFdGMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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