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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fc07c8537b574a879b5a0285755fbc595da9db780ee6a341a79ecfba888f43e' 
  AND token = 'asDLLOACjD34O755bdhr9drMKtIxLo/fEFfyH9Ypu1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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