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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6643686387f94fe5c9ee23ef510ab5269f0dec30159f307cc9eb12b71a4c99' 
  AND token = 'PSh0hZDAXMWdXiHXjii0Pas8c4GWTiDt0W+nfTGVVug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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