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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc7919f11be74612c3b4afba670b1d573b1059b5e67f1a1a614de72c11a86b09' 
  AND token = 'vb/68L9N7jdihL5LLE14wymtJj2ZmhoCWRzCAiKl6Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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