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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e441eada9217694f8e28db663efc1b2604662b4bbf05ba4459b4aa89f3a9fb2' 
  AND token = 'BKeoZaPcaE6jga7HMB59Qkf12IAcsjj9Wdt6i7SfXzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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