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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1c425584e91d7f2d2b3aa355aff4c7d3c6d80ad74fbbc44e01d7e6fe9e08f2' 
  AND token = 'BKIuDjIXRqWqAopgigKr+3IaCfRGI0erEl7iP4Ily4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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