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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eee295a31f2965e1112046b8eb8a8dbd310b75b8f8cd17ec8247844e0f0e419' 
  AND token = 'wImKoncrytMUZ2vCMC9UXfUMuzLvNdtLxdxRSmQRchs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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