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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '840575a8e00561f150bf18b7f06eca42407e9bd6529c6be0353319b40e20c019' 
  AND token = 'rCK2m2JAdEE7DthFB2GMXcIiRUN52xhKGIQvVpnuTLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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