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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f10e5f35f9c23c7f9af320839708f03995d66039bbc59957d520cb1d3ccf5a6' 
  AND token = 'xwVZs+mZVZezQrVmArI+W47rEQU9o77G5p8jP5sSkzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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