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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94749893ee617fae73c4bb70440f0ca381e7e1a077c9f6c02dcd2ecdf530a47b' 
  AND token = 'M5x6BhGhUqkNB8jGb2NA0iWdZdFZUkM0sJRrGmhp+/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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