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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81d7fc3fa11b5531ca34e6dbe2754e9fa7e12cf9d65b673ffcb83ea6465b957f' 
  AND token = 'JkZIOysfzapLvyK3/yHlURyxwBRa9f0RW9F0tJ0npzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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