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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dc2aa41307125f13545c578af9e7c0127d3063c4ca3c3821135ee2963c21130' 
  AND token = 'T3J7qfs/9A/vJNY/UPSRDH9n2zuwdnt5MOtnzM69vFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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