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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68667379c7403bee7c84dd53c9d935ac4303a2af1fc16210bd84ce29e770885d' 
  AND token = 'C0dqovBh+40DVwKVDt8N+jWoIhcL5DSiscrab9oj6c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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