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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a420f036c527bf0ceefbd34bf6b6b94f0202ae80cf23841cf9ed830fb429e7' 
  AND token = '05V07r5hJWEKZxh2TcdjfIPwol0UAig+f3zuQMxezwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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