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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db1b5f31167d22c3d19977b81a45381211dbc8ad1a9ca7e2b47e695a277c5a56' 
  AND token = '73uFiuf/HE8uZAauJdCm8XKeTTNlvHSQWeq0MguXmY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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