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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab5a3a9d221ebde6214bb55984bebffcee395ce0e97046ab829fe888797cd60e' 
  AND token = 'EBVq0lrHjGjaa09Av+cX9IRYxd3u2wlZaYcRSS4nd7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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