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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e36f1ca823c3448d2d8343df53ed9e56c56f9905da37a4717ca57615aef0e64' 
  AND token = 'EOiv2rKFa+FHcvEXDEOdDruArZF6nhrZkq0ChjKnI/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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