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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4a84b0af0e2fdfa831f4f5a7be3e679ef7edbeefe551b2a3cca4bf564ca01d6' 
  AND token = 'a6usm1HmNkWC2ATTBodG6jy7x0rqt49+/H4+Qs/372o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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